Submission #1259100

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259100		tminh	Feast (NOI19_feast)	C++20	41 / 100	73 ms	34624 KiB

feast

#include "bits/stdc++.h"
using namespace std;

#define task ""
#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>


#define ep emplace_back
#define pb push_back
#define pf push_front


const ll mod = 1e9 + 7;
const int N = 1e6 + 5;
const ll oo = 1e18;

bool START;

int n, k;
bool vis[2005][2005][2];
ll a[N], dp[2005][2005][2];


ll f(int pos, int cnt, bool cur) {
	if (pos == n + 1) return (cnt + cur <= k ? 0 : -oo);
	
	ll &res = dp[pos][cnt][cur];
	if (vis[pos][cnt][cur]) return res;
	

	vis[pos][cnt][cur] = true;
	res = f(pos + 1, cnt, 1) + a[pos];
	if (cnt + cur <= k) res = max(f(pos + 1, cnt + cur, 0), res); 
	return res;
}

inline void solve() {
	cout << f(1, 0, 0);
}


inline void input() {
    cin >> n >> k;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    return solve();
}
bool END;

int main() {
    if(fopen(task ".inp", "r")) {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
    return 0;
}

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29